I have been using I-nigma and just tested it with a QR code generator for a vcard (http://zxing.appspot.com/generator/). worked like a charm, its a nice app. Never missed a QR code (url, text, vcard).

it does read bar codes as well. Just tried it on a book lying on my desk, that worked fine but the Aquafina water not as well. Overall as QR code reader it was great.

http://www.i-nigma.com/Downloadi-nigmaReader.html